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Business Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 segment	Dec. 31, 2013	Dec. 31, 2012
Business segment information
Number of reporting segments									2us-gaap_NumberOfReportableSegments
Revenue:
Total revenue	$ 508.0us-gaap_Revenues	$ 419.8us-gaap_Revenues	$ 457.4us-gaap_Revenues	$ 423.7us-gaap_Revenues	$ 552.1us-gaap_Revenues	$ 439.0us-gaap_Revenues	$ 454.9us-gaap_Revenues	$ 393.4us-gaap_Revenues	$ 1,808.9us-gaap_Revenues	$ 1,839.4us-gaap_Revenues	$ 1,791.4us-gaap_Revenues
Operating Income:
Total operating income	44.5us-gaap_OperatingIncomeLoss	4.9us-gaap_OperatingIncomeLoss	35.4us-gaap_OperatingIncomeLoss	20.6us-gaap_OperatingIncomeLoss	61.0us-gaap_OperatingIncomeLoss	31.5us-gaap_OperatingIncomeLoss	43.5us-gaap_OperatingIncomeLoss	12.2us-gaap_OperatingIncomeLoss	105.4us-gaap_OperatingIncomeLoss	148.2us-gaap_OperatingIncomeLoss	156.0us-gaap_OperatingIncomeLoss
Impairment of assets	4.6us-gaap_AssetImpairmentCharges	6.9us-gaap_AssetImpairmentCharges							11.5us-gaap_AssetImpairmentCharges		23.8us-gaap_AssetImpairmentCharges
Goodwill impairment charges									0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Assets:
Total assets	1,864.8us-gaap_Assets				1,988.3us-gaap_Assets				1,864.8us-gaap_Assets	1,988.3us-gaap_Assets
Capital Expenditures
Total capital expenditures									33.8	50.3	72.8
Depreciation and Amortization
Total depreciation and amortization									59.7	61.3	59.1
Eliminations
Revenue:
Total revenue									(18.6)	(17.5)	(10.9)
Corporate, eliminations and other
Operating Income:
Total operating income									2.2	(0.2)	2.4
Assets:
Total assets	(64.1)				(83.5)				(64.1)	(83.5)
BSI
Operating Income:
Impairment of assets									6.4		22.6
Impairment charge of other long-lived assets											4.8
Capital Expenditures
Total capital expenditures									31.5	44.9	60.1
Depreciation and Amortization
Total depreciation and amortization									55.1	56.4	54.6
BSI \| CAM division
Operating Income:
Goodwill impairment charges											1.4
Definite-lived intangible asset impairment charges									0.9		16.4
BSI \| Operating segments
Revenue:
Total revenue									1,674.6	1,709.5	1,666.1
Operating Income:
Total operating income									99.8	138.9	140.8
Assets:
Total assets	1,827.7				1,925.3				1,827.7	1,925.3
BEST
Operating Income:
Impairment of assets									5.1		1.2
Capital Expenditures
Total capital expenditures									2.3	5.4	12.7
Depreciation and Amortization
Total depreciation and amortization									4.6	4.9	4.5
BEST \| Operating segments
Revenue:
Total revenue									152.9	147.4	136.2
Operating Income:
Total operating income									3.4	9.5	12.8
Assets:
Total assets	$ 101.2				$ 146.5				$ 101.2	$ 146.5